On my 2017 Santa Fe equipped with a power lift gate, when the power struts start to fail, it is without warning and intermittent. The lift gate will fully open, then suddenly drop down about a foot before stopping striking the top of the head. At first the drop down would occur several seconds later when one was already under the lift gate and bump the head when moving back. This started about 2 months ago. Hyundai had to replace both power struts where the total job cost just over $1,700.00. The part were $1,244.08. Although I took a video of this with my cell phone, it is too large to email to my Gmail or AOL inbox. Eventually the lift gate could fail completely possible trapping a small person under same.